package com.hmdp.utils;

import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.format.annotation.DateTimeFormat;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

@Component
public class RedisIdWorker {
    @Resource
    private StringRedisTemplate stringRedisTemplate;
    //开始时间戳
  private static final long BEGIN_TIME = 1735689600L;
  //序列号的位数
    private static final  int COUNT_BITS=32;
    public long nextId(String keyPrefix){
        //生成时间戳
        LocalDateTime now = LocalDateTime.now();
        long nowsecond = now.toEpochSecond(ZoneOffset.UTC);
        long timetamp = nowsecond - BEGIN_TIME;
        //生成序列号
        //2.1获取当前日期，精确到天
        String date = now.format(DateTimeFormatter.ofPattern("yyyy:MM:dd"));
        long count = stringRedisTemplate.opsForValue().increment("icr:" + keyPrefix + ":" + date);
        //拼接并返回
        return timetamp<<COUNT_BITS | count;
    }

//    public static void main(String[] args) {
//        LocalDateTime time = LocalDateTime.of(2025, 1, 1, 0, 0, 0);
//        long second = time.toEpochSecond(ZoneOffset.UTC);
//        System.out.println("time"+second);
//
//    }
}
